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Have a look at the following wiki about how to set up a model grid: Set up a model grid
Number of points
Topology (MPI & OpenMP)
Resolution → timestep
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Global grid → adjust global pressure
Due to the semi-lagrangian advection scheme, which does not exactly conserve the total mass of the atmosphere, the GEM model is "loosing air" with time. Therefore, the parameter 'Schm_psadj' from the gem_settings.nml needs to get set to one of the following:
!# * 0 -> No conservation of surface pressure (for LAM grids)
!# * 1 -> Conservation of total air mass pressure (for global grids)
!# * 2 -> Conservation of dry air mass pressure (for global grids)
Cascadeing
Spectral nudging
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